Charms and danglers are common types of Cracker Jack prizes. Throughout the 20th century, Cracker Jack has given away numerous charms in metal, celluloid, and plastic.
In the 1950s, when plastic was king, Cracker Jack gave away a series of plastic alphabet charms. Of course, they had to be collected one letter at a time. The alphabet charms are still collectible today and can be found on eBay or sometimes Etsy or other online sites like Times Passages Nostalgia and Ruby Lane.
Besides the letters of the alphabet, popular were charms depicting animals. Here are a couple made of plastic from the late 1940s, these came in different colors mostly pale:
The animals were also represented by danglers, the slightly larger charms. This one below is a monkey and has "CRACKER JACK" as well as "1389" marked on it: